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相关概念视频

Sex-linked Disorders01:43

Sex-linked Disorders

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Like autosomes, sex chromosomes contain a variety of genes necessary for normal body function. When a mutation in one of these genes results in biological deficits, the disorder is considered sex-linked.
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X-linked Traits01:19

X-linked Traits

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In most mammalian species, females have two X sex chromosomes and males have an X and Y. As a result, mutations on the X chromosome in females may be masked by the presence of a normal allele on the second X. In contrast, a mutation on the X chromosome in males more often causes observable biological defects, as there is no normal X to compensate. Trait variations arising from mutations on the X chromosome are called “X-linked”.
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X and Y Chromosomes02:32

X and Y Chromosomes

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Among mammals, the gender of an organism is determined by the sex chromosomes. Humans have two sex chromosomes, X and Y. Every human diploid cell has 22 pairs of autosomes and one pair of sex chromosomes. A human female has two X chromosomes, while a male has one X chromosome and one Y chromosome.
The germline cells such as egg and sperm cells carry only half the number of chromosomes, i.e., 22 autosomes and one sex chromosome. All eggs have an X chromosome, while sperm cells can carry an X or...
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Human Genetics01:28

Human Genetics

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Human genetics provides a profound framework for understanding the interplay between genetic predispositions and human psychology. At the heart of this discipline lies the study of how genes influence physical traits, behaviors, and susceptibility to diseases. Each person carries a unique genetic code that subtly or significantly shapes their psychological and behavioral landscape.
The complex relationship between genetics and psychology is observable through common biological components such...
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Complementation Tests00:49

Complementation Tests

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A complementation test is a simple cross to identify whether the two mutations are located on the same gene or different genes. It was first performed by Edward Lewis in the 1940s while working on fruit flies. He developed the test to identify the location and arrangement of different mutations on chromosomes.
Organisms heterozygous for different mutations are crossed pairwise in all combinations. If present on different genes, the mutations can complement each other by providing the missing...
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Dosage Compensation02:50

Dosage Compensation

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In animals, gender is determined by the number and type of sex chromosome. For example, human females have two X chromosomes, and males have one X and one Y chromosome, whereas C.elegans with one X chromosome is a male, and the one with two X chromosomes is a hermaphrodite.
In addition to sexual development, the X chromosome has genes involved in autosomal functions such as brain development and the immune system. Therefore, males and females with  distinct numbers of X chromosomes will...
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相关实验视频

Updated: Dec 19, 2025

Sex Stratified Neuronal Cultures to Study Ischemic Cell Death Pathways
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补充基因在各种疾病中有助于性别偏见的脆弱性

Nolan Kamitaki1,2, Aswin Sekar3,4, Robert E Handsaker3,4

  • 1Department of Genetics, Harvard Medical School, Boston, MA, USA. nolan_kamitaki@hms.harvard.edu.

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|June 6, 2020
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概括
此摘要是机器生成的。

补充成分4 (C4) 基因的遗传变异会影响自身免疫性疾病的风险,如狼,Sjögren综合征和精神分裂症,性别之间观察到差异性影响.

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科学领域:

  • 遗传学
  • 免疫学
  • 神经科学

背景情况:

  • 疾病发病率的性别差异,如女性的SLE和Sjögren的较高率和男性的精神分裂症,已经得到了充分证实,但了解得很少.
  • 主性基因相容性复合体 (MHC) 基因与这些疾病有关,其历史重点是人类白细胞抗原 (HLA) 基因.

研究的目的:

  • 研究MHC位点内补充成分4 (C4) 基因变异在解释性别特异性疾病风险中的作用.
  • 确定C4基因基因是否有助于系统性红斑狼 (SLE),斯乔格伦综合征和精神分裂症中观察到的差异性脆弱性.

主要方法:

  • 分析C4基因 (C4A和C4B) 变异及其与大群体疾病风险的关联.
  • 在脑脊液和血中量化C4和C3蛋白质水平,以评估基于性别的差异.
  • 检查C4基因型,性别和SLE,Sjögren综合征和精神分裂症的疾病风险之间的相互作用.

主要成果:

  • C4基因变异显著改变了SLE (7倍) 和Sjögren综合征 (16倍) 的风险,C4A提供了比C4B更强的保护.
  • 发现增加精神分裂症风险的等位基因降低了SLE和Sjögren综合征的风险.
  • 在所有三种疾病中,C4基因基因对男性的影响比女性更强烈,性别特异性风险差异从精神分裂症的1.7倍到Sjögren综合征的31倍.
  • 与女性相比,男性在血和脑脊液中发现了较高的C4和C3蛋白.

结论:

  • 补充成分4 (C4) 基因变异是导致SLE,Sjögren综合征和精神分裂症的性别变异的一个重要因素.
  • 补充系统蛋白质水平的性别差异可能是男性C4等位基因的强大影响的基础,并导致观察到的疾病流行率差异.
  • 补体系统被认为是对各种常见疾病易感性的性二态的一个关键因素.